Method of measurement of building and civil engineering works, Part 20: laying of gas and oil pipelines

IS 1200 Part 20 - Scope Overview

• Applicability:
  Expanded beyond buildings to cover civil engineering works such as industrial projects and river valley projects.

• Purpose:
  Standardizes method of measurement for various civil engineering works, ensuring uniformity across agencies.

• Rounding Off:
  Final test/analysis values must be rounded per IS 2:1960, maintaining the same significant figures as specified.

• Measurement Details:
  Includes detailed descriptions for connections to submains or pipelines (Clause 3.11.2).

Key Points Summary

Reference for Rounding (IS 2:1960)

This standard ensures consistent measurement methods across diverse civil works, facilitating clarity and uniformity in project execution and billing.

flowchart TD
    A[IS 1200 Part 20] --> B[Scope Expanded]
    B --> C[Buildings]
    B --> D[Civil Engineering Works]
    D --> E[Industrial Projects]
    D --> F[River Valley Projects]
    A --> G[Rounding Off]
    G --> H[IS 2:1960 Rules]
    A --> I[Measurement Details]
    I --> J[Pipeline Connections Fully Described]

IS 1200 Part 20: General Rules Summary

This part covers measurement methods for laying gas and oil pipelines. Key general rules include:

• Rounding Off Values (Clause 0.6):
  Final test or analysis results must be rounded as per IS 2:1960 (Rules for rounding off numerical values).

  • The number of significant figures in the rounded value must match the specified value in the standard.

• Measurement Scope:
  Applies specifically to pipeline laying including excavation, pipe laying, jointing, testing, and backfilling.

Important Notes:

• No explicit formulas or tables are provided in the general rules section.
• For detailed measurement rules, refer to specific clauses in IS 1200 Part 20.
• Follow IS 2:1960 for rounding precision to maintain consistency and accuracy.

IS 2:1960 Rounding Rule Example:

flowchart TD
    A[Test Result] --> B{Check Decimal Places}
    B -->|More than specified| C[Round off as per IS 2]
    B -->|Equal or less| D[Retain value]
    C --> E[Final Value]
    D --> E

Use this standard for consistent reporting of measurements in pipeline works.

Clubbing of Items (IS 1200 Part 20)

• Definition (Clause 2.1): Items can be clubbed only if based on detailed descriptions as per the standard.

• Description Inclusion (Clause 2.3): Each item’s description implicitly includes:

  • Conveyance, delivery, handling, loading, storing
  • Fabrication, hoisting
  • Labour for finishing to required shape/size
  • Setting, fitting, fixing in position
  • Straight cutting, waste allowance
  • Return of packings and incidental operations

• Bills of Quantities (Clause 2.5): Must fully describe materials, workmanship, and accurately represent the work.

• Separate Enumeration (Clause 3.2): Components like pipe supports (hangers, chairs, pillars) must be described and measured separately, not clubbed.

Practical Guidelines for Clubbing:

Summary:

Clubbing is allowed only when items share detailed, compatible descriptions and incidental works are included. Separate components, especially structural supports, must be measured independently.

flowchart TD
    A[Items to be Measured] --> B{Are descriptions detailed and compatible?}
    B -- Yes --> C[Items can be clubbed]
    B -- No --> D[Items must be separate]
    D --> E{Are components like hangers, chairs?}
    E -- Yes --> F[Enumerate separately]
    E -- No --> G[Review description]

This ensures clarity and accuracy in measurement and billing.

IS 1200 Part 20: Booking of Dimensions - Key Points

• Order of Dimensions (Clause 2.2):
  Dimensions must be booked consistently in the sequence:
  Length → Breadth/Width → Height/Depth/Thickness

• Measurement Precision (Clause 2.4):
  All dimensions are measured net as fixed, rounded to the nearest 0.01 metre (1 cm).

• Bills of Quantities (Clause 2.5):
  Items must clearly describe materials, workmanship, and represent the work accurately.

Practical Booking Format Example:

Rounding Rule:

• Round off to nearest 0.01 m
  • e.g., 2.345 m → 2.35 m
  • 4.994 m → 4.99 m

flowchart LR
    A[Start Measurement] --> B[Measure Length]
    B --> C[Measure Breadth/Width]
    C --> D[Measure Height/Depth/Thickness]
    D --> E[Round off to nearest 0.01 m]
    E --> F[Record in Bill of Quantities]

This ensures uniformity and clarity in booking dimensions per IS 1200 Part 20.

IS 1200 Part 20 - Dimensions: Key Points

• Measurement Precision:
  All dimensions must be measured net as fixed, rounded to the nearest 0.01 metre (Clause 2.4).

• Order of Booking Dimensions:
  Dimensions should be recorded in the sequence:
  Length → Breadth/Width → Height/Depth/Thickness (Clause 2.2).

• Rounding Off:
  Final values from tests or calculations must be rounded as per IS 2:1960, maintaining the same number of significant digits as specified (Clause 0.6).

Practical Notes:

• Use a consistent unit system (metres) throughout.
• Follow the sequence strictly to avoid confusion in documentation.
• Rounding ensures uniformity and compliance in reporting.

Example Table for Dimension Recording

flowchart LR
    A[Start: Measure Dimension] --> B{Dimension Type}
    B --> C[Length]
    B --> D[Breadth/Width]
    B --> E[Height/Depth/Thickness]
    C --> F[Record to 0.01 m]
    D --> F
    E --> F
    F --> G[Round off as per IS 2:1960]
    G --> H[Dimension Booked]

This ensures uniform measurement and booking of dimensions as per IS 1200 Part 20.

IS 1200 Part 20 (1981) - Bills of Quantities: Key Points

• Purpose: Bills of Quantities (BoQ) must fully describe materials, workmanship, and accurately represent the work to be executed (Clause 2.5).
• Measurement Uniformity: The standard aims to unify measurement methods across building and civil engineering works to avoid ambiguity and ensure consistency.
• Detailed Descriptions: Items like pipe supports (hangers, chairs, pillars) should be separately enumerated and fully described (Clause 3.2).
• Rounding Rules: Numerical values in measurements should follow prescribed rounding rules (not detailed here but important for consistency).
• Scope Expansion: The standard covers both building and civil engineering works, including earthworks and industrial projects.

Typical BoQ Format (based on IS 1200 principles):

Tips for Preparing BoQ per IS 1200 Part 20:

• Use clear, concise descriptions of work and materials.
• Separate components and accessories (e.g., pipe supports).
• Apply standard units and consistent rounding.
• Reference relevant IS 1200 parts for specific work items (e.g., earthwork, concrete).

flowchart TD
    A[Start: Project Scope] --> B[Define Work Items]
    B --> C[Describe Materials & Workmanship]
    C --> D[Measure Quantities per IS 1200]
    D --> E[Apply Rounding Rules]
    E --> F[Prepare Bill of Quantities]
    F --> G[Use for Tendering & Payment]

This ensures clarity, uniformity, and fair payment in civil engineering projects.

IS 1200 Part 20: Measurement of Special Pumping - Key Points

• Clause 2.6.2:
  Special pumping (other than rain or sub-soil water) must be measured separately in kilolitres (kL) of water. This requires a specific provision for measurement.

• Reference:
  For measurement method, see Clause 2.7 of IS 1200 Part 1 (Earthwork).

• Measurement Stages (Clause 2.7):
  Work is measured in stages, specifying height or depth:

  • Below ground/datum line
  • Above ground/datum line
    (Ground/datum line must be specified)

Typical Measurement Formula for Special Pumping Volume

[ \text{Volume of Pumped Water (kL)} = \text{Flow Rate (L/min)} \times \text{Pumping Duration (min)} / 1000 ]

• Flow rate and pumping duration should be recorded accurately.
• Separate meters or logs are recommended for special pumping.

Summary Table: Special Pumping Measurement

flowchart TD
    A[Start Pumping] --> B{Cause of Pumping?}
    B -->|Rain/Sub-soil| C[Not Special Pumping]
    B -->|Other Causes| D[Special Pumping]
    D --> E[Measure Flow Rate]
    E --> F[Record Pumping Time]
    F --> G[Calculate Volume (kL)]
    G --> H[Record Separately]

Note: IS 1200 Part 20 does not provide explicit tables/formulas but refers to Part 1 for earthwork measurement and emphasizes separate measurement and recording of special pumping volumes.

IS 1200 Part 20: Measurement in Stages - Key Points

• Clause 2.7 specifies that measurement shall be done in convenient stages, categorized by:

  • (a) Below ground/datum line
  • (b) Above ground/datum line

• The ground/datum line must be clearly specified for each case.

• Clause 2.4 states all dimensions are measured net to the nearest 0.01 m.

Practical Application

Measurement Formula (Example)

For excavation below datum line:

[ \text{Volume} = \text{Area} \times \text{Depth below datum} ]

For structures above datum line:

[ \text{Height} = \text{Measured height} - \text{Datum level} ]

Notes:

• Use net measurements (exclude overlaps, openings).
• Measurement in stages helps in progress tracking and payment settlements.
• Always define the datum line clearly in the contract documents.

flowchart TD
    A[Start Measurement] --> B{Stage?}
    B -->|Below Datum| C[Measure depth below datum line]
    B -->|Above Datum| D[Measure height above datum line]
    C --> E[Calculate volume/length/area]
    D --> E
    E --> F[Record net measurement to 0.01 m]
    F --> G[Use for progress/payment]

This approach ensures clarity and uniformity in civil engineering works measurement per IS 1200 Part 20.

IS 1200 Part 20 specifies the Method of Measurement for Laying Gas and Oil Pipelines. Although the provided context is limited, key points and typical measurement methods include:

Key Measurement Items:

• Length of pipeline laid (measured along the centerline)
• Diameter and thickness of pipes (for classification)
• Type of pipeline: buried, above ground, or in trenches
• Fittings and accessories: bends, tees, valves, flanges
• Trench excavation and refilling
• Testing and commissioning

Typical Measurement Formulas:

• Pipeline length (L): measured in meters along centerline

• Volume of pipe (V):
  [ V = \pi \times \frac{(D_o^2 - D_i^2)}{4} \times L ]
  where (D_o) = outer diameter, (D_i) = inner diameter, (L) = length

• Weight of pipe (W):
  [ W = V \times \rho ]
  where (\rho) = density of pipe material

Measurement Specifications:

• Pipes are measured net length excluding overlaps.
• Fittings are measured per piece.
• Excavation and refilling are measured per cubic meter.
• Testing and commissioning are measured lump sum or per unit length.

Summary Table Example:

flowchart LR
    A[Start Measurement] --> B[Measure Pipeline Length]
    B --> C{Pipe Diameter & Thickness}
    C --> D[Calculate Volume & Weight]
    D --> E[Count Fittings]
    E --> F[Measure Excavation Volume]
    F --> G[Measure Refilling Volume]
    G --> H[Record Testing & Commissioning]
    H

IS 1200 Part 20: Classification and Measurement of Pipes

Key Points from Clauses:

• Classification:

  • By diameter, material type, quality, and joining method.
  • Pipes measured in running metres along the central line between fittings or specials.

• Measurement:

  • Length is taken along the pipe centerline, excluding fittings.
  • Fittings and specials are measured and described separately as "extra over" pipes.
  • Cutting/jointing pipes to fittings is included in the fitting item.

• Tests:

  • Hydrostatic tests measured in running metres.
  • Radiographic tests measured per centimetre length depending on pipe size.

Summary Table for Measurement:

Practical Formula for Pipe Length Measurement:

[ L = \sum_{i=1}^n l_i ]

Where:

• (L) = Total length of pipe (running metres)
• (l_i) = Length of each pipe segment measured along centerline

flowchart LR
    A[Pipes] --> B[Measure length along centerline]
    B --> C[Exclude fittings]
    C --> D[Enumerate fittings separately]
    D --> E[Cutting/jointing included with fittings]
    A --> F[Classify by diameter, material, quality, joining]
    A --> G[Measure hydrostatic & radiographic tests separately]

Note: Always refer to IS 1200 Part 20 for detailed measurement rules and descriptions.

IS 1200 Part 20: Pipes Laid in Ducts, Trenches, and Chases - Key Points

• Clause 3.3 & 3.4: Pipes in ducts, trenches, chases, or embedded in floor screed must be clearly described in specifications, including pipe size, location, and fixing method.

• Clause 3.5: Excavation and refilling of trenches for pipe laying are measured as per IS 1200 Part 1 (1974). Measurement is by running meters, considering trench width, depth, and length.

• Clause 3.6: Concrete beds, haunchings, and coverings are measured in running meters with:

  • Pipe size
  • Concrete dimensions (depth, width)
  • Concrete mix (e.g., M20, M25)

Typical Measurement Formula for Trenches (IS 1200 Part 1)

[ \text{Volume of Excavation} = \text{Length} \times \text{Width} \times \text{Depth} ]

• Width = Pipe diameter + clearance on both sides (usually 150 mm each side)
• Depth = Depth of pipe invert + bedding thickness + cover thickness

Concrete Bed Volume (Running Meter)

[ \text{Volume} = \text{Length} \times \text{Width of bed} \times \text{Thickness} ]

Summary Table: Typical Dimensions

flowchart LR
    A[Pipes in Ducts/Trenches] --> B[Excavation as per IS 1200 Pt 1]
    B --> C[Measure Length, Width, Depth]
    A --> D[Concrete Bed & Haunching]
    D --> E[Measure Running Meter with Dimensions]
    E --> F[Specify Concrete Mix]

Note: Always refer to project-specific drawings and IS codes for exact dimensions and mix designs.

IS 1200 Part 20: Pipes Embedded in Floor Screed — Key Points

• Description & Measurement (Clauses 3.4, 3.6):

  • Pipes embedded in floor screed must be clearly described.
  • Concrete beds/haunchings/coverings are measured in running metres.
  • Specify pipe size, concrete dimensions, and mix.

• Supporting Components (Clause 3.2):

  • Hangers, chairs, pillars, etc., must be described and measured separately.

• Insulation (Clause 3.10.1):

  • Measured in running metres along pipe centerline.
  • Include pipe type and size.
  • No extra measurement for insulation bevelling at ends/flanges.

Typical Measurement Format Example:

Notes on Concrete Mix (Typical):

• M20 (1:1.5:3) for pipe bedding is common.
• Thickness of concrete cover: 50-75 mm over pipes.

flowchart LR
    A[Pipes Embedded in Floor Screed] --> B[Concrete Bed & Haunching]
    A --> C[Supports (Hangers, Chairs)]
    A --> D[Insulation]
    B --> E[Measured in Running Metres]
    C --> F[Count & Describe Separately]
    D --> G[Measured Along Pipe Centerline]

This ensures clarity in measurement and specification for accurate billing and construction control.

IS 1200 Part 20 – Tests: Key Points

• Rounding Off Results (Clause 0.6):
  Test results must be rounded as per IS 2-1960.

  • Retain the same number of significant figures as the specified value in the standard.

• Types of Tests (Clause 3.8):

  • Hydrostatic Tests: Measured in running metres.
  • Radiographic Tests: Measured per centimetre length of pipe.

Summary Table for Test Measurements

Additional Notes:

• Hydrostatic testing ensures pipe integrity under pressure.
• Radiographic testing detects internal defects using X-rays or gamma rays.
• Always refer to IS 2-1960 for rounding rules to maintain precision and compliance.

flowchart LR
    A[Pipe Section] --> B[Hydrostatic Test]
    B --> C[Measure in Running Metres]
    A --> D[Radiographic Test]
    D --> E[Measure per Centimetre Length]

This ensures clarity in test reporting and compliance with IS 1200 Part 20.

IS 1200 Part 20 primarily covers measurement methods for laying gas and oil pipelines, including pigging, pickling, and purging, but does not provide detailed formulas or tables for these processes.

Key Points from IS 1200 Part 20:

• Clause 3.9: Pigging, pickling, and purging with inlet gases must be separately enumerated (measured and recorded distinctly).
• These operations are considered separate items in measurement and payment.
• No direct formulas or tables are provided for pigging, pickling, or purging quantities.

Engineering Practice (Supplementary Information):

• Pigging: Cleaning pipeline by pushing a device ("pig") through the pipe.
• Pickling: Chemical cleaning of pipe interiors using acid solutions.
• Purging: Flushing the pipeline with inert gases (e.g., nitrogen) to remove air or contaminants.

Typical Measurement Units:

Example formula for Purging Volume:

[ V = A \times L ]

Where:

• (V) = volume of gas required (m³)
• (A) = cross-sectional area of pipe (m²)
• (L) = length of pipeline section (m)

Summary:

• IS 1200 Part 20 requires separate measurement of pigging, pickling, and purging.
• Use running meters for pigging and pickling.
• Use gas volume or running meters for purging.
• Refer to process-specific standards or project specs for detailed procedures and quantities.

flowchart LR
    A[Pipeline Laying] --> B[Pigging]
    A --> C[Pickling]
    A --> D[Purging]
    B --> E[Measure length cleaned]
    C --> F[Measure length treated]
    D --> G[Measure gas volume or length purged]

IS 1200 Part 20 - Miscellaneous Works: Key Points

• Clause 3.11.1: Miscellaneous works (e.g., railway crossings, culverts, pavement cutting, pipeline deviations, dismantling) are measured as per relevant standards.

• Clause 3.11.2: Connections to submains or other pipelines must be fully described and enumerated.

• Clause 3.2: Pipe support components (hangers, chairs, pillars) must be separately described and enumerated.

Measurement Guidelines:

• Refer to IS 1200 Part I (Earthwork) for earthwork-related measurements.
• Miscellaneous works are itemized based on the nature of the work and connection details.

Summary Table (Conceptual):

Diagram: Miscellaneous Works Measurement Flow

flowchart TD
    A[Start: Identify Miscellaneous Work] --> B{Type of Work}
    B -->|Railway Crossing| C[Refer Railway Standards]
    B -->|Culvert| D[Measure Dimensions & Materials]
    B -->|Pavement Work| E[Measure Area/Length]
    B -->|Pipeline Deviation| F[Enumerate Length & Fittings]
    B -->|Dismantling| G[Item-wise Description]
    B -->|Pipe Supports| H[Enumerate Supports]
    C & D & E & F & G & H --> I[Prepare Detailed Bill of Quantities]

Note: For exact quantities and detailed measurement, always cross-reference with the relevant IS parts and project specifications.